SKYWARN Self-Activation Coordination Message 08/04/20

TROPICAL STORM ISAIAS UPDATE

Isaias is expected to track quickly through western New England early tonight. The majority of storm impacts will be felt in roughly a 6 hour period this evening.

Southerly winds are expected to increase in the early evening and gust to 40 to 60 mph at times as Isaias tracks near the Connecticut River Valley. This may be capable of downing some trees and power lines. In addition, there will be a threat for isolated tornadoes on the eastern side of Isaias. Winds will begin to diminish early Wednesday morning.

Rainfall totals of 1 to 3 inches are expected, mainly in the Connecticut River Valley and White Mountains. This may lead to flash flooding in complex terrain or poor drainage areas, in addition to minor river flooding. Parts of the forecast area near the coast may see less than 1 inch of rainfall.

In general, the coastal flooding threat is low based on the forecast forward speed of Isaias, with any inundation likely less than a foot. Some splashover is expected tonight however. Rough surf and an increased risk for dangerous rip currents will be possible both ahead of Isaias this afternoon and behind it on Wednesday.

NEW INFORMATION

* CHANGES TO WATCHES AND WARNINGS:
– None

* CURRENT WATCHES AND WARNINGS:
– A Tropical Storm Watch is in effect for Central Somerset,
Interior Waldo, Kennebec, and Southern Somerset
– A Tropical Storm Warning is in effect for Androscoggin,
Belknap, Central Interior Cumberland, Cheshire, Coastal
Cumberland, Coastal Rockingham, Coastal Waldo, Coastal York,
Eastern Hillsborough, Interior Cumberland Highlands, Interior
Rockingham, Interior York, Knox, Lincoln, Merrimack, Northern
Carroll, Northern Coos, Northern Franklin, Northern Grafton,
Northern Oxford, Sagadahoc, Southern Carroll, Southern Coos,
Southern Franklin, Southern Grafton, Southern Oxford,
Strafford, Sullivan, and Western And Central Hillsborough
– A Tornado Watch is in effect for Cheshire, Hillsborough, Merrimack, Rockingham, Strafford, and Sullivan

* STORM INFORMATION:
– About 440 miles southwest of Portland ME or about 390 miles
southwest of Portsmouth NH
– 39.1N 76.1W
– Storm Intensity 70 mph
– Movement North-northeast or 20 degrees at 35 mph

SKYWARN Self-Activation will monitor Isaias for local impacts Tuesday afternoon into Wednesday morning. The rough time frame of worst conditions will be late Tuesday afternoon, into the early overnight hours of Wednesday, but some deteriorating conditions could start earlier, with lingering conditions lasting till around daybreak Wednesday morning depending on track, speed and intensity.

Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. Please activate local nets as necessary. Nets are expected to commence on the KQ1L link system and 147.090 repeater in Maine, beginning around 4:00 PM Tuesday afternoon, or as the storm dictates.

Reports may be emailed at any time to: gyx.skywarn@noaa.gov

Be alert and stay safe.

73′

Tim Watson
KB1HNZ

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